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The rippled surface of the first Martian sand dune ever studied up close

The rippled surface of the first Martian sand dune ever studied up close fills this view of 'High Dune' from the Mastcam on NASA's Curiosity rover. This site is part of the 'Bagnold Dunes' field along the northwestern flank of Mount Sharp.

Io: Moon Over Jupiter   8 April 2012 Astronomy Picture of the Day  This Cassini photo shows Jupiter's moon, Io. Io is the most volcanic body in the solar system and is about the size of Earth's moon.

Io: Moon Over Jupiter 8 April 2012 Astronomy Picture of the Day This Cassini photo shows Jupiter's moon, Io. Io is the most volcanic body in the solar system and is about the size of Earth's moon.

International Space Station silhouetted against the moon

Funny pictures about International Space Station silhouetted against the moon. Oh, and cool pics about International Space Station silhouetted against the moon. Also, International Space Station silhouetted against the moon photos.